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Rain fails after 2038-01-19

See original GitHub issue

Describe the bug Rain test fails after 2038-01-19

To Reproduce

on openSUSE, I build the package with

osc co openSUSE:Factory/python-asciimatics
osc build --vm-type=kvm --noservice --clean --build-opt=--vm-custom-opt="-rtc base=2038-01-20T00:00:00" --alternative-project=home:bmwiedemann:reproducible openSUSE_Tumbleweed

Expected behavior

tests should continue to pass in future

Screenshots

 =================================== FAILURES ===================================
 ___________________________ TestParticles.test_rain ____________________________
 
 self = <tests.test_particles.TestParticles testMethod=test_rain>
 
     def test_rain(self):
         """     
         Test that Rain works as expected.
         """     
         screen = MagicMock(spec=Screen, colours=8)
         canvas = Canvas(screen, 10, 40, 0, 0)
         effect = Rain(canvas, 200)
 >       self.check_effect(canvas,
                           effect,
                           lambda value: self.assertIn(chr(value[0]), ' `\\v'))

 tests/test_particles.py:98:
 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
 tests/test_particles.py:43: in check_effect
     self.assertTrue(changed, "failed at step %d %s" % (i, view))
 E   AssertionError: False is not true : failed at step 0

==== 1 failed, 149 passed, 41 skipped, 1 deselected, 966 warnings in 3.67s =====

System details (please complete the following information):

OS and version: openSUSE-Tumbleweed-20220906
Python version: 3.10
Python distribution: cpython
Asciimatics version 1.14.0

Additional context See also https://en.wikipedia.org/wiki/Year_2038_problem

As part of my work on reproducible builds for openSUSE, I check that software still gives identical build results in the future. The usual offset is +16 years, because that is how long I expect some software will be used in some places. This showed up failing tests in our package build. See https://reproducible-builds.org/ for why this matters.